DEWESOFT DEWE-43A User manual
DEWE-43A
TECHNICAL REFERENCE MANUAL
DEWE-43A V20-2
1
DEWE-43A
TECHNICAL REFERENCE MANUAL
1. Table of contents
1. Table of contents 2
2. About this document 4
2.1. Legend 4
2.2. Online versions 5
2.2.1. DEWE-43A technical reference manual 5
2.2.2. DewesoftX® tutorials 5
3. Specifications 6
3.1. Hardware revisions 8
3.1.1. Analog input configuration: 8
3.1.2. ADC: 8
3.1.3. CMRR: 13
3.1.4. Counter and digital inputs: 14
Image 10: counter and input overvoltage protection block diagram 14
4. Device operation 15
4.1. Connectors 16
4.1.1. Analog input 16
4.1.2. CAN connector 16
4.1.3. Counter input 17
4.1.4. Power supply 17
4.1.5. Sync connector 17
4.2. Typical sensor connection 18
4.2.1. Bridge sensor connection 20
5. Software installation 23
6. Using DEWE-43A in DewesoftX® 24
6.1. Connecting DEWE-43A 24
6.2. DewesoftX® Settings DEWE-43A 24
6.2.1. Start up of the device 25
6.3. Simple measurement 26
6.3.1. Help - manual 26
6.3.2. Analog channel setup 27
6.3.3. Sample rate 28
6.3.4 Measurement Mode 29
6.3.5. Analyse Mode 30
7. Firmware upgrade 31
8. DewesoftX® license information 32
9. Warranty information 33
9.1. Calibration 33
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9.2. Support 33
9.3. Service/repair 33
9.4. Restricted Rights 33
9.5. Printing History 34
9.6. Copyright 34
9.7. Trademarks 34
10. Safety instructions 35
10.1. Safety symbols in the manual 35
10.2. General Safety Instructions 35
10.2.1. Environmental Considerations 35
10.2.2. Product End-of-Life Handling 35
10.2.3. System and Components Recycling 35
10.2.4. General safety and hazard warnings for all Dewesoft systems 36
11. Documentation version history 38
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2. About this document
This is the Technical Reference Manual for DEWE-43A.
The manual is divided into several chapters. You will find:
- A description of the system and the main combination and expansion options
- The description of the connection variants and the pin assignments on the inputs and outputs
- A comprehensive introduction to the configuration of the slices using DewesoftX® software.
- Technical data
2.1. Legend
The following symbols and formats will be used throughout the document.
Important
Gives you important information about a subject.
Please read carefully!
Hint
Gives you a hint or provides additional information about a subject.
Example
Gives you an example to a specific subject.
Safety symbols in the manual:
Warning
Calls attention to a procedure, practice, or condition that could cause the body injury or death
Caution
Calls attention to a procedure, practice, or condition that could possibly cause damage to
equipment or permanent loss of data.
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2.2. Online versions
2.2.1. DEWE-43A technical reference manual
The most recent version of this manual can be downloaded from our homepage:
https://download.dewesoft.com/list/manuals-brochures/hardware-manuals
In the Hardware Manuals section click the download link for the DEWE-43A technical reference
manual.
2.2.2. DewesoftX® tutorials
The DewesoftX® tutorials document, provides basics and additional information and examples for
working with DewesoftX® and certain parts of the program.
The latest version of the DewesoftX® tutorials can be found here:
https://download.dewesoft.com/list/manuals-brochures/software-manuals
In the Software Manuals section click the download link of the DEWESoft X3 tutorials entry.
Important
Read safety instructions first in chapter 8. Safety instructions.
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3. Specifications
Analog inputs
Number of channels
8
Inputs
Voltage, full bridge
ADC type
24 bit sigma delta with anti-aliasing filter
Sampling rate
Simultaneous 200 kS/sec
Input type
Differential
Voltage ranges
±10 V
±1 V
±100 mV
±10 mV
DC accuracy
0,05 % of
value +1 mV
0,05 % of
value +0.2 mV
0,05% of value
+0.1 mV
0,05 % of value
+0.1 mV
CMRR@ 50Hz/400Hz/1kHz
85 dB / 92 dB
/ 89 dB
97 dB / 97 dB /
88 dB
100 dB / 97 dB
/ 89 dB
101 dB / 97 dB /
89 dB
Sensor supply
12 V, 350 mA (Shared between: 8xAI, 8xCounters, 2xCAN)
Excitation voltage
±5 V ±0.1 % bridge sensor supply, 70 mA limit
Overvoltage protection
±70 V input protection
Noise floor
107 dB @ ±10 V range
Input impedance
20 MΩ || 47 pF (differential)
10 MΩ || 33 pF (common mode)
Maximum common mode voltage
±13 V
Signal to noise:
0.1 kS/s to 51.2 kS/s
51.2 ks/s to 102.4 kS/s
102.4 kS/s to 200 kS/s
105 dB
100 dB
75 dB
Channel-to-Channel Phase Mismatch
<0.1° @ 5 kHz
Phase-to-Phase Mismatch
0.6° @ 1 kHz
Counter/Digital inputs
Number of channels
8 counters/24 digital input, fully synchronized with analog
Modes
Counting, waveform timing, encoder, tacho, geartooth
sensor
Counter timebase
102.4MHz
Time base accuracy
Typical: 5 ppm, Max: 20 ppm
Max. Bandwidth
10MHz
Input Filter
500 ns, 1 μs, 2 μs, 4 μs, 5 μs and 7.5 μs
Counter resolution
32-bit
Compatibility
TTL/CMOS
Configuration
Pull-up with 100kΩ
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Input low level
-0,7 V to 0.7 V
Input high level
2 V to 5 V
Overvoltage protection
±30 V input protection
CAN bus
Number of ports
2
Interface type
CAN 2.0B, up to 1 MBit/sec
Special applications
CCP, OBDII, J1939, CAN output
Galvanic isolation
Isolated
Bus pin fault protection
±36 V
ESD protection
8 kV
Interfaces and options
USB
USB-B mini, USB 2.0 interface
Synchronisation
2x SIRIUS® SYNC
Power
Power supply
9 - 36 V DC
Galvanic isolation
ISO-POWER Isolated
Sensor power supply
Up to 10W total:
12 V, total limit 350 mA (Shared between: 8xAI, 8xCounters,
2xCAN)
5 V, total limit 700 mA (Shared between: 8xCounters,
2xCAN)
+/-5 V Exc., Ch. limit 70 mA
Power consumption
Typ. 6 W, Max. 18 W
Environmental
Operating Temperature
Max. 60 °C down to -20 °C
Storage Temperature
-40 to 85 °C
Humidity
5 to 95 % RH non-condensing at 50 °C
IP rating
IP50
Shock & Vibration
Vibration sweep sinus (EN 60068-2-6:2008)
Vibration random (EN 60721-3-2: 1997 - Class 2M2)
Shock (EN 60068-2-27:2009)
MIL-STD-810D
Physical
Dimensions
225 x 80 x 45 mm
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3.1. Hardware revisions
DEWE-43V
Initial version
DEWE-43A
Added isolated CAN ports
DEWE-43A ISO-POWER
Added isolated power supply
3.1.1. Analog input configuration:
Block diagram of analog input (all analog inputs are identical):
Image 1: Block diagram of analog input
The high input impedance (10MΩ ground referenced) has no distortion influence on the measured
signal.
3.1.2. ADC:
The DEWE-43A uses 8 delta-sigma A/D converters. If you sample with a data rate of 102.4 kS/s, the ADC
actually samples the input signal with 13.1072 MS/s (multiply the data rate with 128) and produces 1-bit
samples which are applied to the digital filter. The filter expands the data to 24-bits and rejects signal
parts greater than 51.2 kHz (Nyquist frequency). It also re-samples the data to the more conventional
rate of 102.4 kS/s. A 1-bit quantizer introduces many quantization errors to the signal. The 1-bit, 13.1072
MS/s from the ADC carry all information to produce 24-bit samples at 102.4 kS/s. The delta-sigma ADC
converts from high speed to high resolution by adding much random noise to the signal. In this way the
resulting quantization noise is restricted to frequencies above 100 kHz. This noise is not correlated with
the useful signal and is rejected by the digital filter.
ADCs can only represent signals of a limited bandwidth. The maximum frequency you can represent is
the half of the sampling rate. This maximum frequency is also called Nyquist frequency. The bandwidth
between 0 Hz and the Nyquist frequency is called Nyquist bandwidth. Signals exceeding this frequency
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range can not be converted correctly by the sampler. For example, the sample rate is 1000 S/s, the
Nyquist frequency is 500 Hz. If the input signal is a 375 Hz sine wave, the resulting samples represent a
375 Hz sine wave. If a 625 Hz sine wave is sampled, the resulting samples represent a 375 Hz sine wave
too. This happens because signals exceed the Nyquist frequency (500 Hz). The represented frequency of
the sine wave is the absolute value of the difference between the input frequency and the closest
integer multiple of the sampling rate (in this case 1000 Hz).
When the sampler modulates frequencies out of the Nyquist bandwidth back to the 0 to 500 Hz
baseband it is called aliasing. Signals which are not pure sine waves can have many components
(harmonics) above the Nyquist frequency. These harmonics are erroneously aliased back to the
baseband, added to parts of the accurately sampled signal and produces a distorted data set. To block
frequencies out of the Nyquist bandwidth, a lowpass filter is applied to the signal before it reaches the
sampler. Each input channel has its two pole anti-alias lowpass filter with a cutoff frequency of about
250 kHz. The very high cutoff frequency allows an extremely flat frequency response in the bandwidth of
interest and a small phase error. The analog filter precedes the analog sampler. The analog sampler
operates at 256 times the selected sample rate for rates below 51.2 kS/s, 128 times for rates between 51.2
kS/s and 102.4 kS/s. For rates over 102.4 kS/s the oversampling is 64 times. That means, the ADC operates
at 13.1072 MS/s if you select a sample rate of 102.4 kS/s (128 * 102.4 kS/s).
The 1-bit oversampled data is passed to a digital anti-aliasing filter. This filter has no phase error and an
extremely flat frequency response. It also has an extremely sharp roll-off near the cutoff frequency (0.38
to 0.494 times the sample rate) and the rejection above 0.5465 times the sample rate is greater than 92
dB. The output stage of the digital filter resamples higher frequencies to 24-bit samples. The digital filter
passes only signal components within the Nyquist bandwidth or within multiples of the Nyquist
bandwidth of 64, 128 or 256 times (depending on sampling rate). The analog filter rejects most noise
near these multiples. The following diagrams show the frequency response of the input circuitry.
Image 2: Sample rate 0.1kS/s to 51.2kS/s
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Image 3: Sample rate 51.2kS/s to 102.4kS/s
Image 4: Sample rate 102.4kS/s to 200kS/s
The ADC samples at 64, 128 or 256 times the data rate (depending on the adjusted sample rate).
Frequency components above one half of the oversampling rate (> 32, 64 or 128) can alias. Most of this
frequency range is rejected by the digital filter. The filter can not reject components that lie close to
integer multiples of the oversampling rate because it can not differentiate these components from
components between 0 Hz and the Nyquist frequency. That means, if the sample rate is 100 kS/s and a
signal component is between 50 kHz and 12.8 MHz (128 x 100 kHz), this signal will be aliased into the
passband region of the digital filter and is not rejected. The analog filter removes these components
before they get to the digital filter and the sampler.
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If aliasing is caused by a clipped or overranged waveform, (exceeding the voltage range of the ADC) it
can’t be rejected with any filter. The ADC assumes the closest value to the actual value of the signal in its
digital range when the signal is clipping. The result of clipping is also a sudden change in the signal
slope and results in corrupt digital data with high-frequency energy. This energy is spread over the
complete frequency spectrum and is aliased back into the baseband. Do not allow the signal to exceed
the input range to avoid this.
Image 5: Idle channel noise (input terminated with 50Ω)
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Image 6: Spectral noise - 50Ω termination – 8 averages – 16k lines@50kS/s
Image 7: Spectral noise - 50Ω termination – 10 averages – 16k lines@100kS/s
Image 8: Spectral noise - 50Ω termination – 10 averages – 16k lines@200kS/s
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3.1.3. CMRR:
All 8 analog channels of the DEWE-43A are fully differential inputs with resistance of 10MΩ||10pF. The
input voltage range is ±10V, ±1V, ±100mV and ±10mV. Because of the differential input structure, the
difference of the input (Ch x(+) – Ch x(-)) will be shown as the result of the measurement. Although the
input is protected for input voltages to ±70V, the common voltage range of each input is limited to
about ±13V. If the input voltage exceeds this range, the result is not valid even when the difference input
voltage is lower than current input range. These voltage ranges will be clipped and introduced as large
errors that can be easily identified in the frequency spectrum. The image below shows the allowable
common-mode input voltages for various input voltages and measurement ranges.
Image 9: Common-mode input voltages
Example: Many signal sources (function generators) and power supplies are floating sources. That
means that they are isolated from each other and from AC power line. If we connect a sensor with
differential output and floating power supply to measurement device, then GND of sensor and
measurement device can have different voltage potential. This is what the measurement device sees as
common mode voltage. This common-mode voltage can range from few volts to few hundred volts, but
in almost all cases this renders the measurement. To prevent this effect, GND signals of the sensor and
measurement device need to be directly connected. That way we eliminate common-mode voltage. On
DEWE-43A this connection is possible over connector GND wire or over “Common GND” receptacle on
the housing.
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3.1.4. Counter and digital inputs:
The DEWE-43A is suited with synchronous 32-bit advanced counter and digital inputs.
In addition to the basic counter function like simple event counting, up/down counting and gated event
counting also period time, pulse width, two edge separation, frequency and all encoder measurements
are supported. All counter inputs can also be used as digital inputs. In addition to the basic counter
input selections, ADC Clock can also be used as counter source. The image below shows the block
diagram of the counter and input overvoltage protection.
Image 10: counter and input overvoltage protection block diagram
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4. Device operation
Image 11: Top side connectors
Image 12: Side connectors
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4.1. Connectors
4.1.1. Analog input
Pin
Description
1
EXC+
2
IN+
3
Sense-
4
AGND
5
+12V
6
Sense+
7
IN-
8
EXC-
9
TEDS
Image 13: Analog input connector (9-pin D-SUB female)
4.1.2. CAN connector
Pin
Description
1
+5V
2
CAN_LOW
3
DGND
4
RES
5
RES
6
DGND
7
CAN_HIGH
8
RES
9
+12V
Image 14: CAN connector (9-pin D-SUB male)
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4.1.3. Counter input
Pin
Name
Description
1
IN0/A
Input A
2
IN1/B
Input B
3
IN2/Z
Input Z
4
GND
Ground
5
+5V
5V supply
max. current: 100mA
6
+12V
12V supply
max. current: 10mA
7
GND
Ground
Image 15: Mating cable connector: FGG.1B.307CLAD52
4.1.4. Power supply
Mating cable connector: FGJ.1B.302CLLD42Z
Image 16: LEMO EGJ.1B.302.CLA
4.1.5. Sync connector
Pin
Name
Description
1
CLK
Clock
2
TRIG
Trigger
3
RES
PPS
4
GND
Ground
Image 17: Mating cable connector: FGG.00.304CLAD27Z
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Important
When IRIG-synchronisation is used, the IRIG signal is on pins 1,2
When PPS synchronization is used, the PPS signal is on pin 3
When Clock-Trigger synchronization is used, the signal is on pin 1,2
4.2. Typical sensor connection
For correct measurements, it is highly recommended to ground the DEWE-43A with GND banana plug
on the side.
Image 18: Typical sensor connection
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Image 19: Single ended and potentiometer sensor connection
Important
If sensors or other signal sources with isolated external power supply are used, ground signals
of DEWE-43A and external power supply should be connected over connector GND wire or
over “common GND” input on housing to prevent common-mode voltage problems.
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4.2.1. Bridge sensor connection
●Full bridge 10V excitation:
Image 20: Full bridge mode
●Half bridge 10V excitation:
Image 21: Half bridge mode
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